WAEC - Mathematics (1998 - No. 28)
In the diagram above, the area of triangle ABC is 35cm\(^2\). Find the value of y
5cm
10cm
17.5cm
28cm
70cm
คำอธิบาย
Area of triangle ABC = 35cm\(^2\).
Area of triangle ABC = \(\frac{1}{2}\) x B x H
= 0.5 x y x 7 = 35
= 3.5y = 35
y = \(\frac{35}{3.5}\) = 10 cm.